b The average weekly hours
were assumed to be constant for air transportation industries; therefore, the
output per hour worked and the output per employee measures are
identical.

c Full-time and part-time
employees are counted equally. Hence, these data do not reflect output per
full-time equivalent employee.

NOTE

BLS
developed labor productivity indexes for all manufacturing and retail trade
of the North American Industry Classification System (NAICS) industries as
well as selected mining, transportation, communications and services
industries.

SOURCE

U.S. Department of Labor, Bureau of Labor Statistics, Industry Productivity,
available at http://www.bls.gov/lpc as of August 11, 2009.